Leather-cutting machine



Feb. 3, 1931 c. UNRUH LEATHER CUTTING MACHINE Filed Aug. 5 Sheets-Sheet I l Feb. 3, 1931, .c, UNRUH 1,791,253

LEATHER CUTTING MACHINE Filed Aug. '1, 1929 s Sheets-Sheet 2 33 61am v 5 I MW 1m Feb. 3, 1931. c. UNRUH LEATHER CUTTING MACHINE Filed Aug 1; 1929 3 Sheets-Sheet 3 Svwentoz I C/zn'sfz'an 022mm. 351 Gum/m1, @AW

Patented Feb. 3, 1931 UNITE STATES CHRISTIAN UNRUH, OF GLEN UL'LIN, NORTH DAKOTA LEATHER-CUTTING MACHINE Application filed August 1, 1929. Serial No. 382,695.

This invention relates to improvements in cutters, particularly to a machine for cutting leather into a plurality of strips, strops or belts of a predetermined width, and it is the principal object of my invention to provide a machine in which the leather is carried by hand against a plurality of knives while being positively guided through the machine.

Another object of my invention is the provision of a leather cutting machine adapted to be readily attached to any suitable support and of comparatively simple construction,yet durable and eflicient in operation.

Still another object ofmy invention is the provision of a leather cutter equipped with a cutter having a plurality of cutting ed ges, and adapted to be readily released and turned so as to present a new cutting edge to the material to be out.

A further object of my invention is the provision of a leather cutter allowing the convenient attachment of a plurality of auxiliary knives'or cutters if more than one strip is to be cut at one time from a piece of material. A

A still further object of my invention is the provision of a cutter equipped with a graduated and longitudinally slotted table for accurately determining the width of the strips to be cut by the proper setting of the material guide by means displaceable in the slot of the table.

It is furthermore one of the objects of my invention to provide a leather cutter allowing the cutting of soft and hard leather of'any thickness and a machine equipped with suitable guides for the material.

These and other objects and advantages of my invention will become more fully known as the description thereof proceeds and will then be specifically defined in the appended claims.

In the accompanying drawing, forming a material part of this disclosure:

Fig. 1 is a front elevation of a leather cutting machine constructed according to my invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a section on line 3-3 of Figure 1.

Fig. 4 is a sectional side elevation of a leather guide seen along line 4+4 of Figure 2.

Fig. 5 is a section on line 5-5 of Figure 1.

Fig. 6 is a front elevation of the machine constructed according to my invention and equipped with means for cutting a plurality of belts or straps at one time.

Fig. 7 is a section on line 7 7 of Figure 6.

Fig. 8 is a detail view of an auxiliary knife. I

As illustrated, my machine for cutting leather into belts or straps of varying width comprises a base 10 which may be bolted to any suitable support or table 11 by means of a supporting member 12 firmly held againsttable and base by means of screw bolts 13 and nuts 1 1 or in any like suitable manner.

The base 10 carries the standards 15 and 16, the upper ends of which are formed into bearings 17, 18 for a shaft 19 one end of which is held in a bearing 20 depending from the end. of a longitudinallv slotted table 21 having graduations 22 on its upper face.

At the other end, the shaft 19 carries loosely a pulley 23 rotatably arranged on shaft 19. by means of which the leather can be guided while it is drawn by hand through themachine.

' The shaft 19 is held in its bearings by means of the set screws 24.

The maincutter knife 25 is substantially S-shaped and has diagonally oppositely disposed, relatively reversed cutting edges 26, 27, and is carried by shaft 19 and secured near its upper end to a bracket 28 depending at one end from table 21, and by means of a bolt- 29 to standard 16.

Any desired number of auxiliary knives 3Q may be attached to shaft 19 by means of suit able sockets 31 in which the knives are held, secured to shaft 19 by means of screws 32 or the like.

A guide through which the leather 3& is v guided is adjustable for the various thicknesses of the leather and comprises two gripper members 33 and 35 respectively, the lower of which, 35 has a corrugated upper face36.

The guide is guided on table 21 by an ana nut 39.

The upper member 33 is held against arm 37 by a bolt 40 carrying at its upper end a nut 41 and at its lower end a nut 42, and a spring 43 is wound about the boltv between member 33 and nut 41 which has the tendency to press the end of member 33 against arm 37 while another bolt 44 is screwed at its lower end, as at 45, into the end of lower member 35 and extends through an opening in the end of member 33, having a spring 46 wound about its central part between members 35 and 33 which has the tendency to press the members apart for the introduction of the leather to be cut.-

My machine operates as follows:

If comparatively thin leather is to be cut the screw 45 is loosened and the nut 40 tightened while if it is desired to cut comparatively thick material, the screw 45 is tightened and the nut 40 loosened. The material is then drawn by the hand against the knives,

. after the arm 37 has been properly set on the desired number on the scale. If auxiliary knives are to be used for the simultaneous cutting of a plurality of strips or straps, these knives are placed into the corresponding sockets 31- and these sockets placed to the proper width indicated on the scale and then fastened by means of screws 32.

If one cutting edge of the stationary knife 25 becomes dull, the knife is removed by removing bracket 28 and stud 29, and can then be turned about 19 to present the other cutting edge to the goods.

The rotating wheel 23 will guide the material during the cutting operation.

It will be clear that I have disclosed the preferred form of my machine only as one ex ample, and that I may make such changes in its construction as come within the scope of the claims without departing from the spirit of my inventionf Having thus described my invention, what I cla m as new, and desire to secure by Letters Patent is:

1. In a leather cutting machine, a graduated table, a material guide adapted to be adjusted along said table and locked in the proper position indicated by the graduations, said guide composed of two superposed arms, and a means connecting said arms at one on d for adj ustin the guide to different thicknesses of material.

2. In a leather cutting machine, a grad uated, longitudinally slotted table, a material guide adapted to be adjusted along the graduations of said table, an arm for said guide, means displaceable in the longitudinal slot of the table for locking said arm of the guide in any of its adjusted positions, said guide composed of two superposed arms, the lower one having its upper face corrugated,

and a pair of spring controlled screws for allowing an adjustment of the guide arms to accommodate material of varying thickness.

3. In a leather cutting machine, a base, a horizontal shaft supported above said base, a stationary cutter near one end of said shaft, sockets adapted to be attached to said shaft at certain predetermined points, auxiliary cutters adapted to be entered and held in said sockets, a graduated table and a material guide having an arm adapted to be moved over said graduated table and locked in any of its adjusted positions, and means for regulating the guide'for the reception of leather of varying thickness.

4. In a leather cutter, a material guide comprising two superposed members, an arm held between said members near one end thereof and angularly disposed thereto, a spring controlled pin screwed into the lower of said members, and a spring controlled bolt in juxtaposition to said pin allowing an adjustment of the guide relatively to the thickness of the material to be out.

5. In a leather cutter, a material guide composed of two superposed members, an arm angularly disposed to said members and held between the ends of the same, a bolt passing through both arms, a nut on said bolt, a spring round about said bolt, between said nut and said upper member, a screw pin screwed into the lower of said members and passing through the upper member, and a spring wound about said pin between said upper and said lower member, said pin to be loosened and said bolt to be tightened for guiding comparatively thin material through the members, and vice versa for the guiding of thick material therethrough.

In witness whereof I have signed my name to this specification.

CHRISTIAN UNRUI-I. 

